One factor that may be fostering turn taking in humans and lowering the number of episodes needed to achieve it, is the fact that reward is perceived differently in social contexts in which the obtained reward is compared among rewards obtained by others. Receiving the same amount of reward than a previous trial may be perceived differently if this reward is lower than what the other got (loss aversion), or simply it may happen that an inequity aversion principle is present because of social and cultural constructs. For this purpose we introduced a manipulation of the reward function in the form of an utility in a similar way than [1]}. Agents perceive reward in the form of utility:
\(U_i(r_i,r_j,r^{ref}_i,r^{ref}_j)=r_i - \alpha \max (0,r^{ref}_j-r^{ref}_i)-\beta \max (0,r^{ref}_i-r^{ref}_j)\) 
